John's

Phyllis invested 67000 dollars, split between two different accounts. The money in the first account earns simple interest at the rate of 4 percent per year. The money in the second account earns simple interest at the rate of 6 percent per year. After on...

Stan and Hilda can mow the lawn in 20 minutes if they work together. If Hilda works twice as fast as Stan, how long would it take Stan to mow the lawn alone?

A car's cooling system of a car has a capacity of 15 liters. suppose that it is currently full of a 40% antifreeze mixture. you want 60% antifreeze mixture so you drain some of the current mixture and then add the pure antifreeze. How much antifreeze shou...

1 hour